add update.py that can update the repo and config.py based on new variables in config.py.example

src/config.py.example

@@ -51,4 +51,4 @@ wifi_signal = False
 wifi_signal_dbm = False
 
 # this works only on raspbery pi version 5 with stock fan
-rpi5_fan_speed = False
+rpi5_fan_speed = False

src/update.py

@@ -0,0 +1,50 @@
+import ast
+import os
+import subprocess
+
+
+script_dir = os.path.dirname(os.path.realpath(__file__))
+os.chdir(script_dir)
+
+def get_assignments(filename):
+    with open(filename) as f:
+        tree = ast.parse(f.read(), filename)
+
+    assignments = {node.targets[0].id: ast.literal_eval(node.value) for node in ast.walk(tree) if isinstance(node, ast.Assign)}
+    return assignments
+
+def update_config(current_config, example_config):
+    current_assignments = get_assignments(current_config)
+    example_assignments = get_assignments(example_config)
+
+    missing_assignments = {var: value for var, value in example_assignments.items() if var not in current_assignments}
+
+    if missing_assignments:
+        with open(current_config, 'a') as f:
+            for var, value in missing_assignments.items():
+                f.write(f'\n{var} = {value!r}')
+
+def display_config_differences(current_config, example_config):
+    current_assignments = get_assignments(current_config)
+    example_assignments = get_assignments(example_config)
+
+    missing_assignments = {var: value for var, value in example_assignments.items() if var not in current_assignments}
+
+    if missing_assignments:
+        print("Missing variables:")
+        for var, value in missing_assignments.items():
+            print(f'{var} = {value!r}')
+        return True
+    else:
+        return False
+
+repo_path = os.path.dirname(os.path.realpath(__file__))
+
+result = subprocess.run(['git', '-C', repo_path, 'pull'], check=True, text=True, capture_output=True)
+print(result.stdout)
+
+if display_config_differences('config.py', 'config.py.example'):
+    print("Updating config.py")
+    update_config('config.py', 'config.py.example')
+else:
+    print("No config.py updates needed")